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MENTAL MODEL · M3374

Deductive Reasoning

Deductive Reasoning
StructureHigh supportLogic
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Version 1.0.0 · Updated 2026-07-28

CORE DEFINITION

Deductive reasoning is the process of drawing valid inferences. An inference is valid if its conclusion follows logically from its premises, meaning that it is impossible for the premises to be true and the conclusion to be false. For example, the inference from the premises "all men are mortal" and "Socrates is a man" to the conclusion "Socrates is mortal" is deductively valid. An argument is sound if it is valid and all its premises are true.

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Deductive reasoning is the process of drawing valid inferences. An inference is valid if its conclusion follows logically from its premises, meaning that it is impossible for the premises to be true and the conclusion to be false.

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A reasoning process that necessarily derives a specific conclusion from general premises; if the premises are true and the form is valid, the conclusion must be true; it is the core of mathematics and formal logic, alongside induction and abduction.

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Source support: Explicit

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    en.wikipedia.orghttps://en.wikipedia.org/wiki/Deductive_reasoningZH · Explicit
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